Confused by error log

[dweems]

I'm getting the following error on an indicator I developed, but I can't make sense out of it. As you see, I'm on bar 28 from my chart but it says there are only 4 bars on the chart. The other element of what makes this strange is that it only happens when I restart NinjaTrader on a chart with this indicator already defined. It doesn't happen if I start the indicator from the GUI. I have a test on CurrentBar to ensure it is greater than any series. Any idea why this might happen?

"Error on calling 'OnBarUpdate' method on bar 28: You are accessing an index with a value that is invalid since it is out-of-range. I.E. accessing a series [barsAgo] with a value of 5 when there are only 4 bars on the chart."

[NinjaTrader_ChelseaB]

Hello dweems,

Strategies and indicators start processing from the first bar, CurrentBar 0, in OnBarUpdate() when processing the historical data. They don't start with the last bar, in your case CurrentBar 28.

If you call Close[1] when CurrentBar is 0, this is the error you will get.

Below is a link to a forum post on index errors.

https://ninjatrader.com/support/forum/forum/ninjatrader-8/indicator-development/1046200-indicator-that-calculate-in-different-chartime?p=1048513#post1048513

Make sure CurrentBar is greater than any barsAgo indexes you use.

[dweems]

I'm confused why you say my "last" bar starting at 28. As the error message states, CurrentBar is 28, not 4. I have code that returns from OnBarUpdate() if CurrentBar is less than 28. This seems to be something to do with restarting a chart after shutdown since it works fine if I start it after the chart has loaded. I thought CurrentBar indicates what bar the chart is on when entering OnBarUpdate(). And in no situation do I have a barsAgo field that exceeds 28. Indeed, the error message indicates it fails on barsAgo = 5. Indeed, as a test, I doubled the test value to 56 and it still fails. Another oddity : even though the message appears in the log, the indicator runs to completion anyway. Is it possible the indicator is running once before the chart loads, fails at that point, and then runs again afterward?

[NinjaTrader_ChelseaB]

Hello dweems,

What is the specific line of code with the index that is causing the error?
(Meaning if you comment that line out, the error stops)

Also, no, I would not expect the indicator to continue working after experiencing an index error.

Can you reproduce after closing all workspaces and opening a new blank workspace with a new blank chart, with only this one indicator added?

Can you copy the line of code (and the check for enough bars) to a new script without copying any other code and still reproduce?

[eDanny]

And no, the error is not on bar 5. That is just an example of that type of error. Your error is on bar 28.